H.P. Lovecraft's Philosophy of Horror (2014)
newrepublic.com
newrepublic.com
Still a hugely influential writer in SF/horror, despite his highly regrettable (read: bigoted) and misanthropic outlook. I attribute his enduring relevance to his fiction providing the opposite of a science fictional sense of wonder: he brought a sense of cosmic dread at our insignificance in the face of an uncaring universe front and center, and in the post-nuclear age this resonates loudly.
In fact Lovecraft wrote a whole short story, "A Reminiscence of Dr. Samuel Johnson", mocking himself about this.
In other words, writers don't have to pay licenses or royalties for use of the universe, and their stories can enjoy the benefit of being framed by the previously-written canon without being pigeonholed. I would think this can help grease the wordsmith's skids.
[0] I don't know if any of this is true or factual, I'm very open to corrections and other interpretations!
http://www.antipope.org/charlie/blog-static/2015/06/they-too...
Interesting read, though. I had no idea Lovecraft wasn't well-known in his time. Certainly he'd have been pleased, I think, to have known of his future fame.